One disk, one drive pin and then use a stepper with fwd rev speed pot setting board and home and index pulse on the platter.. easy peasy, control with simple io pins for fwd reverese.
??? ääämmm what??? now i´m really conufsed... i don´t know what i have to doing now?
CNC_ANDI,
Remember earlier when I mentioned a geneva wheel is simpler to control, but more complex to fabricate?
And also that the 'stock' verison of PB's control scheme is based on a geneva wheel?
Lcvette is one of the Probe Basic devs and
wrote the PB toolchange logic. He was suggesting that you use a geneva wheel mechanism as the software configuration is easier than with a position-mode stepper or servo.
I do not know your fabrication skills or available tools. If you are capable of fabricating a geneva wheel then you might give some consideration to @Lcvette's suggestion.
If you are not capable of fabricating a geneva wheel, then it's a moot point and you need to pursue a position-mode stepper system for the ATC.
Lcvette,
I know, we've been through the geneva vs. position-stepper before. You're absolutely right in that if somebody has a geneva mechanism your PB scheme is damn near plug-and-play with just a few IO.
But not everyone can build a geneva mechanism that is reliable, or wants to go through a number of iterations (
is it too small/weak? too big? how much motor power do I need? etc.) to get one sorted out.
For those folks, myself included, I've pursued a position-mode stepper/servo option. Requires more fiddling with the control scheme than yours, but really isn't difficult to let carousel.comp do the heavy lifting to position the platter.
Like everything in LCNC, it comes down to choices: do you want to spend more time on the mechanical side, or more time on the software?
-R
